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Oct 31, 2012 9:00am PDT
's actually carrying. we usually measure this as a volume per unit time. the united states commonly says cubic feet per second. most of the world uses cubic meters per second moving down the channel. discharge increases from the head of the stream to the stream mouth as the drainage basin increases. there's simply a larger area to contribute discharge, to contribute flow to the streams. the primary way that a river functions geologically is to transport not just water, but sediment, down slope and toward the oceans. the faster a river flows, the more efficient this process becomes, so geologists are acutely interested in flow velocity. when the flow velocity of a stream is relatively high, the energy of the moving water is converted into processes that lift chunks of bedrock or sedimentary particles from the bottom and carry them downstream. this is known as erosion. there are three different erosional processes that operate in rivers. the first is hydraulic action. the turbulence of a rapidly flowing stream applies vertical forces that lift sedimentary grains off of the bottom. the flowing cu
Oct 29, 2012 9:00am PDT
's a critique, and we all know one problem with, you know, speaking about islam in the united states is that we've had political tensions, cultural tensions for, you know, many years now with the oil producing states, the arab states, where- actually, the arabs are a minority in islam; you know, the greatest population is indonesia and it's really very global. but some of the difficulty to speak about beauty in islam is that the media, of course, has raked islam, you know, over the coals in the quest of various political agendas that, you know, this nation and industrial oil- needing nations have put down on them. and that tension is real- i mean, there is tension. but nevertheless, this sense of totality of beauty and unity that one senses in islam is there. just one last pillar, and then i can get you, janet, so you can get our pillars out of the way here. of course, the pilgrimage to mecca- one must do that. and again, we're talking about myth and ritual and experience, doctrine, ethics, social dimension- all of them come together in that area, because mohammed- in fact, there's this wonderf
Oct 29, 2012 4:00pm PDT
-arid desert plains of the southwest united states, where rainfall averages just 2 1/2 centimeters per month, tom maddock studies this scarce resource. dr. maddock: the real problem that we have is that with increasing populations and shortages of water, we are becoming very vulnerable. in the southwest, there's a very unique vulnerability here, simply because where do we get the water if there is no water? narrator: across the country in northern florida, the quantity of water isn't an issue. rainfall averages an abundant 1 1/4 meters each year. wendy graham and her colleagues evaluate and model the impacts of industrial and agricultural land use threatening the world's largest collection of freshwater springs. dr. graham: right now, the biggest question is how far we can stress the system and not push it past the point of no return. narrator: both researchers are working towards a sustainable future to protect the water needed by our species and our planet. arizona is one of the fastest-growing states in the u.s. the consequent demand on freshwater for personal, industrial, and agricultura
Oct 30, 2012 9:00am PDT
and practicing the true islam- and within the context of the united states, given the issues of slavery, given the issues of even- you know, if there's anything worse than slavery- the institutionalized racism that followed that up post-civil war, it's understandable that you would see this kind of need for self-esteem and empowerment. anyway, enough said on my end. we have a remarkable video piece. abdus salam was a dentist, joined the- with elijah muhammad in i think 1957, was there through everything, a friend of malcolm x, current friend of louis farrakhan, associate of wd mohammed. but when we ran across abdus salam, he just recently had begun to back away from the more exclusive attitudes within nation of islam, and he'd joined an al-fatihah mosque and was seeing islam in a much more inclusive way. nevertheless, he's very articulate in speaking about the early dynamics in the movement that called for a reinterpretation of islamic doctrine. and people say, "well, why islam? why not christianity?" well, as dr. salam so eloquently put it in another interview, you know, christianity was the
Search Results 0 to 3 of about 4